package com.atguigu.safe;

import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.jar.JarOutputStream;

public class NotSafeDemo {
    public static void main(String[] args) {
        Map<String, String> map = new ConcurrentHashMap<>();
        map.put("1", "张三");
        map.put("2", "李四");
        System.out.println(map.size() + map.get("1"));
    }
    private static void mapNotSafe(){
        Map<String,String> map = new ConcurrentHashMap();
        for (int i = 0; i <=100 ; i++) {
            new Thread(()->{
                map.put(Thread.currentThread().getName(), UUID.randomUUID().toString().substring(0,6));
                System.out.println(map);;
            },String.valueOf(i)).start();
        }
    }

    private static void setNotSafe(){
        Set<String> set = new CopyOnWriteArraySet();
        for (int i = 0; i <=100 ; i++) {
            new Thread(()->{
                set.add(UUID.randomUUID().toString().substring(0,6));
                System.out.println(set);;
            },String.valueOf(i)).start();
        }
    }

    private static void listNotSafe(){
        List<String> list = new CopyOnWriteArrayList<>();
        for (int i = 0; i <=100 ; i++) {
            new Thread(()->{
                list.add(UUID.randomUUID().toString().substring(0,6));
                System.out.println(list);;
            },String.valueOf(i)).start();
        }
    }
}

